Winding for dynamo-electric machines.



G. R. MAXWELL. WINDING FOR DYNAMO ELECTRIC MAGHIHES. APPI IOATION FILED JUNE 16, 1905. RENEWED APR. 10, 1908.

905 ,900. v Patented Dec. 8, 1908.

Ill/III- |J|h llllllln.. T /l/l/I I IIIIH u .4Ilumnuun4 a I INVENTOR ATT'ORNEY an s'rnrns rare rice.

GEORGE R. MAX E OF PITTSBURG, PENNSYLVANIA, As'sIIcNoR To WESTINGHOUSE ELECTRIC aMANUFAoTURINe COMPANY, A CORPORATION or PENNSYLVANIA.

WINDING FOR Dynamo-anaemic MACHINES.

' Specification of Letters Patent'. Application filed June 16, 1906, Serial No. 266,595. Renewed- April 10, 1908.

Patentedljcis', 196 Serial No. 426,317.

lowingis a specification.

My Invention relates to windings for dynamo-electri'c machines, and particularly to the end connections of such armature windings as are adapted for use with polyphase generators of relatively large ca acity and high speed that comprise revolving field mzignets having a relatively small number of po es.

The object o fmyinvention is to rovide end connections for'armature win ings of polyphase generators that shall be of rigid construction; that shall maintain an e uality in the amount of copper in the win ings corresponding to the several phases and that shall permit the removal of a coil for repairs from anyone slot with'minimum expenditure of labor and with a minimum disturbv ance of the winding.

Windings 'hich have been used in the prior art the manufacture of turbo-generators and similar high speed electrical machines were usually composed of coils having a large number of conductors,-the

conductors in any one slot being connected at both ends with the conductors in another slot removed therefrom by a considerable number of intervening slots by reason of the small number of oles, so that the end connections involved a great number of connections' and com rised long, heavy groups of conductors. E ach side of each coil usually extended a short distance in a substanti' 3y straight line beyond the ends of the then a short distance radially away from the axis of the core, and then in a curve which merged into one of large radius that was substantially concentric with the inner surface of the core and parallel to its end surface, The winding was divided into groups and alternate groups were curved inopposite directions from radial lines. Adjacent groups which extended away from each other were in the same plane parallel to the end of the core, and. adjacent groups which crossed seve al faces was materially unba anced in or similar damage without a materialdis- I turbance of the winding; To obviate these difliculties, the end connections of each coil in the winding of my invention are located partially in-two planes, one portion being parallel and near to the end of the core while the other portion is in a parallel plane to th first but'outside a portion similar to the first on a next adjacent group, so that, passing around the core from one group to the next in one direction, each group overlaps a portion of the succeeding ad acent group. A further advantage of this arrangement lies in the fact that the bending which is neo'es s'arily involved in passing from one plane to another serves to stiffen the end connections, rendering them less liable to become distorted {or any reason, such as, a shortcircuit on the winding.

My invention is illustrated in the accompanying drawing, in which-' Figure 1 is an end elevation of an armature core for a dynamo-electric machine that embodies my invention, andFi 2 is a partial sectional elevation through t e end connec- %ions and a portion of the core shown in Referring'to the drawings, a magnetizable core 1 is 'suppor d by a frame 2 and is provided with a plur lity of slots in its concave, cylindrical surface, in which a magnetizing winding is located, the end connections of the windin being dis osed in two planes paralleltot e end of t e core.

The coils from the set of slots-3, 4, 5, 6, 7 and 8 are bent radiall away from the center of the core and then OllOW curves of considerable radius into paths that are substantially concentric with the center of the core and. parallelwith its end'surface, in a well known manner; The coils follow a closeto the end of the core, past a series of slots 9 to 14;, to a radial line oa between slots 14 and 15, where they are bent into another plane further removed from the end of the core to avoid interference with the coils from-slots 15 to 20 which forma group similar to the coils from slots 3 to 8 and also v follow the plane nearer the end of the core to a radial line o b between slots 26 and 27,

where they are also bent into the outer plane. The coils from'theslots 3 to 8 are connected with those from the slots 21 to- 26. The

plane coils from the slots 27 to 32 follow paths similar to those of the groups from slots 3 to 8 and 15 to 20, being bent from one plane to the other. near a radial line 0-0 between slots 38 and 3. Thus, the end connections of each group overlap those of the next succeeding group passing around the core, in one direction.

Although I have shown and described a specific arrangement applied to a single type of machine, I desire that all variations in size and form which effect similar results shall be included in the scope of my invention.

I claim as my invention:

1. A winding for dynamo-electric machines comprising a plurality of groups of coils having end connectors all portions of which, except their extremities, are substantially concentric with the machine axis and the concentric portion of each of which has a single radius of curvature, the end connectors of each group being partially under the preceding and partially over the succeeding adjacent groups.

2. A winding for dynamo-electric machines comprising a plurality of groupsofv coils having end connectors all portions of which, except their extremities, are substantially concentric with the machine axis and the concentric portion of each of which has a single radius of curvature, corresponding portions of the several groups being outside the adjacent groups.

3. A winding forgjazdynamo-electric machines comprising a fplurality of groups of coils having end connectors all portions of which, except their extremities, are subst an tially concentric with the machine axis and the concentric portion of each of which has a single radius of curvature, corresponding portions of the several groups being outside the adjacent groups and all the groups being similar in form.

4. A winding for dynamo-electric machines comprising a plurality of groups of coils having end connectors all portions of which, except their extremities, are substantially concentric with the machine axis and the concentric portion of each of which has a sin is radius of curvature, one portion of eac group of end connectors being next to the core, the other portion overlapping the first portion of the next adjacent group and the conductors,which are connected at one, end to the outer ortion, being connected at f the other end to t e inner portion.

5. In a dynamo-electric machine, the com} I bination with a magnetizable core provided of groups of similar end connectors, a corre' sponding portion of each group being outside the next adjacent group passing around the core face in one direction, and in a plane parallel to that of said adjacent group.

7 In a dynamo-electric machine, the combination with a frame, a slotted core and coils located in and projecting beyond said core slots into different planes, of a plurality of groups of similar end connectors each of which occupies two parallel planes and is partially under and partially over the respective adjacent groups.

8. In a dynamo-electric machine, the combination with a frame having a slotted core, of a plurality of groups of conductors located I in and projecting beyond the ends of the core slots, and a plurality of groups of end connectors which are bent at their middle points so that they overlap and are disposed n two planes parallel to the end of the core.

9. In a dynamo-electric machine, the combination with a frame having a slotted core,

of a plurality of groups of conductors located in the core slots and projecting beyond the ends thereof, said conductors having end connectors all portions of which, except their extremities, are substantially concentric with the machine axis and the middle portions of which are providedwith ofi'set bends so that the groups are disposed in planes suh'stan tially parallel to the end ot the core.

10. In a dynamo-electric 'machine, thea slotted combination with a frame hav' core, ofa winding having a plurality of sym= metrical, overlap nectors each of W ic planes and com rises non-concentric curved extremities an concentric body portions each of which has a single radius of curvature.

In testimony whereof, I have hereunto groups of .end con; -occupies two parall el subscribed my name this 12th day of June GEO. R. MAXWELL.

Witnesses:

R. J DEARBORN, Wnsnnr G. CARR. 

